In the mud equipment industry, mechanical devices (vibrating & rotating cylindrical screens) used to screen solids from the mud, with the entire circulated volume passing through or over the screens. See "Primary Separator".
A vibrating screen for sifting out rock cuttings from drilling mud. Drilling mud returning from downhole, carrying rock chips in suspension. Flows over and through the mesh of the shale shaker leaving small fragments of rocks which can be collected and examined for information about the formations being drilled.